- Calculate the molar enthalpy of formation of methane (CH4) given that ?H?c of carbon-graphite is -393.5kJmole-1,Hydrogen is -285.7 kJmole-1 and that of methane is 890...(Solved)
Calculate the molar enthalpy of formation of methane (CH4) given that ΔHᶿc of carbon-graphite is -393.5kJmole-1,Hydrogen is -285.7 kJmole-1 and that of methane is 890 kJmole-1
Date posted: February 20, 2019. Answers (1)
- Place 100cm3 of distilled water into a plastic beaker/calorimeter. Determine its temperature and record it at time =0 in table I below.(Solved)
Place 100cm3 of distilled water into a plastic beaker/calorimeter. Determine its temperature and record it at time =0 in table I below.
Answer the questions below
Date posted: February 20, 2019. Answers (1)
- Place 50cm3 of 2M hydrochloric acid into a calorimeter/200cm3 plastic beaker wrapped in cotton wool/tissue paper. Record its temperature T1.Using a clean measuring cylinder, measure...(Solved)
Place 50cm3 of 2M hydrochloric acid into a calorimeter/200cm3 plastic beaker wrapped in cotton wool/tissue paper. Record its temperature T1.Using a clean measuring cylinder, measure another 50cm3 of 2M sodium hydroxide. Rinse the bulb of the thermometer in distilled water. Determine the temperature of the sodium hydroxide T2.Average T2 andT1 to get the initial temperature of the mixture
T3.
Carefully add all the alkali into the calorimeter/200cm3 plastic beaker wrapped in cotton wool/tissue paper containing the acid. Stir vigorously the mixture with the thermometer.
Determine the highest temperature change to the nearest 0.5oC T4 as the final temperature of the mixture. Repeat the experiment to complete table 1.
Answer the questions below
Date posted: February 20, 2019. Answers (1)
- Place 20cm3 of 0.2M copper(II)sulphate (VI) solution into a calorimeter/50cm3 of plastic beaker wrapped in cotton wool/tissue paper.
Record its temperature at time T= 0.
Stir the...(Solved)
Place 20cm3 of 0.2M copper(II)sulphate (VI) solution into a calorimeter/50cm3 of plastic beaker wrapped in cotton wool/tissue paper.
Record its temperature at time T= 0.
Stir the solution with the thermometer carefully and continue recording the temperature after every 30 seconds .
Place all the (1.5g) Zinc powder provided.
Stir the solution with the thermometer carefully and continue recording the temperature after every 30 seconds for five minutes.
Determine the highest temperature change to the nearest 0.5oC
Answer the questions below
Date posted: February 20, 2019. Answers (1)
- Determine the specific heat capacity of a solution of a solution mixture of
50.0cm3 of 2M potassium hydroxide neutralizing 50.0cm3 of 2M nitric(V)
acid if a 13.25oC...(Solved)
Determine the specific heat capacity of a solution of a solution mixture of
50.0cm3 of 2M potassium hydroxide neutralizing 50.0cm3 of 2M nitric(V)
acid if a 13.25oC rise in temperature is recorded.(1mole of potassium hydroxide produce 55.4kJ of energy)
Date posted: February 19, 2019. Answers (1)
- The molar enthalpy of neutralization was experimentary shown to be 51.5kJ per mole of 0.5M hydrochloric acid and 0.5M sodium hydroxide. If the volume of...(Solved)
The molar enthalpy of neutralization was experimentary shown to be 51.5kJ per mole of 0.5M hydrochloric acid and 0.5M sodium hydroxide. If the volume of sodium hydroxide was 20cm3. what was the volume of hydrochloric acid used if the reaction produced a 5.0oC rise in temperature?
Date posted: February 19, 2019. Answers (1)
- Place 20cm3 of 0.2M copper(II)sulphate(VI)solution into a 50cm3 plastic beaker/calorimeter. Determine and record the temperature of the solution T1.Put all the Zinc powder provided into...(Solved)
Place 20cm3 of 0.2M copper(II)sulphate(VI)solution into a 50cm3 plastic beaker/calorimeter. Determine and record the temperature of the solution T1.Put all the Zinc powder provided into the plastic beaker. Stir the mixture using the thermometer. Determine and record the highest temperature change to the nearest
0.5oC- T2 . Repeat the experiment to complete the table. Answer the questions below
Date posted: February 19, 2019. Answers (1)
- 1.0 g of carbon burn in excess air to raise the temperature of 400g of water by 18oC. Determine the molar heat of combustion and...(Solved)
1.0 g of carbon burn in excess air to raise the temperature of 400g of water by 18oC. Determine the molar heat of combustion and hence the heating value of carbon(C-12.0,).
Date posted: February 19, 2019. Answers (1)
- Explain the methods used to reduce pollution from common fuels(Solved)
Explain the methods used to reduce pollution from common fuels
Date posted: February 19, 2019. Answers (1)
- Explain other factors used to determine the choice of fuel for domestic and industrial use(Solved)
Explain other factors used to determine the choice of fuel for domestic and industrial use
Date posted: February 19, 2019. Answers (1)
- Calculate ?Hr from the following reaction:
H2(g) + Cl2(g) -> 2HCl(g)(Solved)
Calculate ΔHr from the following reaction:
H2(g) + Cl2(g) -> 2HCl(g)
Date posted: February 19, 2019. Answers (1)
- Define Standard enthalpy/heat of reaction(Solved)
Define Standard enthalpy/heat of reaction
Date posted: February 19, 2019. Answers (1)
- Calculate the molar heat of vaporization of water.(H= 1.0,O= 16.O)(Solved)
Calculate the molar heat of vaporization of water.(H= 1.0,O= 16.O)
Date posted: February 19, 2019. Answers (1)
- Write brief notes on:
1. Melting/liquidification/fusion
2.Freezing/fusion/solidification
3.Boiling/vaporization/evaporation
4.Condensation/liquidification(Solved)
Write brief notes on:
1. Melting/liquidification/fusion
2.Freezing/fusion/solidification
3.Boiling/vaporization/evaporation
4.Condensation/liquidification
Date posted: February 19, 2019. Answers (1)
- Define energy and state the two types of energy(Solved)
Define energy and state the two types of energy
Date posted: February 19, 2019. Answers (1)
- Study the flow chart below and use it to answer the questions that follow(Solved)
Study the flow chart below and use it to answer the questions that follow
Date posted: February 19, 2019. Answers (1)
- State and explain the observations made when a filter paper dipped in Lead(II) ethanoate /Lead (II) nitrate(V) solution is put in a gas jar containing...(Solved)
State and explain the observations made when a filter paper dipped in Lead(II) ethanoate /Lead (II) nitrate(V) solution is put in a gas jar containing hydrogen sulphide gas
Date posted: February 19, 2019. Answers (1)
- Fill a burette wuth 0.1M dilute sulphuric(VI)acid. Pipette 20.0cm3 of 0.1M sodium hydroxide solution into a 250cm3 conical flask. Add three drops of phenolphthalein indicator....(Solved)
Fill a burette wuth 0.1M dilute sulphuric(VI)acid. Pipette 20.0cm3 of 0.1M sodium hydroxide solution into a 250cm3 conical flask. Add three drops of phenolphthalein indicator. Titrate the acid to get a permanent colour change.Repeat with 0.1M potassium hydroxide solution in place of 0.1M sodium hydroxide solution.
State and explain the observations made.
Date posted: February 19, 2019. Answers (1)
- Place 5cm3 of 0.2M dilute sulphuric(VI)acid into four separate clean boiling tubes. Add about 0.1g of copper(II)oxide to one boiling tube. Stir.
Repeat by adding Zinc...(Solved)
Place 5cm3 of 0.2M dilute sulphuric(VI)acid into four separate clean boiling tubes. Add about 0.1g of copper(II)oxide to one boiling tube. Stir.
Repeat by adding Zinc oxide, calcium carbonate and Sodium (II)Oxide in place of the Copper(II)Oxide
State and explain the observations made.
Date posted: February 19, 2019. Answers (1)
- Put about 2cm3 of Concentrated sulphuric (VI) acid into two separate boiling tubes. Place a thin moist/damp/wet filter paper dipped in acidified potassium dichromate (VI)solution...(Solved)
Put about 2cm3 of Concentrated sulphuric (VI) acid into two separate boiling tubes. Place a thin moist/damp/wet filter paper dipped in acidified potassium dichromate (VI)solution on the mouth of the boiling tube.
Put about 0.5g of powdered charcoal and sulphur powder to each boiling tube separately, Warm. State and explain the observations made.
Date posted: February 19, 2019. Answers (1)